Web painfully slow after Mountain Lion update

Caporegime
Joined
18 Oct 2002
Posts
28,092
Location
London
A friend of mine is having serious problems with his 2010 MPB after updating Lion to Mountain Lion. Safari takes tens of minutes to load a page and Chrome says he has DNS errors. He has tried a range of solutions posted on the internet but has had no luck.

This is over our wireless network, all other connected devices are working fine. Has any one encountered this problem?
 
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